package cc.openhome;

import java.util.Scanner;

public class Average4 {
	public static void main(String[] args) {
		double sum = 0;
		int count = 0;
		while(true) {
			int number = nextInt();
			if(number == 0) {
				break;
			}

			sum += number;
			count++;
		}
		System.out.printf("平均 %.2f%n", sum / count);
	}

	static Scanner console = new Scanner(System.in);

	static int nextInt() {
		String input = console.next();
		while(!input.matches("\\d*")) {
			System.out.println("请输入数字");
			input = console.next();
		}
		return Integer.parseInt(input);
	}
}
